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Abstract

In this study, a novel composite was fabricated by adding the Hafnium diboride (HfB2) to conventional WC-Co cemented carbides to enhance the high-temperature properties while retaining the intrinsic high hardness. Using spark plasma sintering, high density (up to 99.4%) WC-6Co-(1, 2.5, 4, and 5.5 wt. %) HfB2 composites were consolidated at 1300℃ (100℃/min) under 60 MPa pressure. The microstructural evolution, oxidation layer, and phase constitution of WC-Co-HfB2 were investigated in the distribution of WC grain and solid solution phases by X-ray diffraction and FE-SEM. The WC-Co-HfB2 composite exhibited improved mechanical properties (approximately 2,180.7 kg/mm2) than those of conventional WC-Co cemented carbides. The high strength of the fabricated composites was caused by the fine-grade HfB2 precipitate and the solid solution, which enabled the tailoring of mechanical properties.
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Bibliography

[1] J.H. Lee, I.H. Oh, J.H. Jang, S.K. Hong, H.K. Park, J. Alloys Compd. 786, 1-10 (2019).
[2] J. Garcia, V.C. Cipres, A. Blomqvist, B. Kaplan, Int. J. Refract. Met. Hard Mater. 80, 40-68 (2019).
[3] S.A. Shalmani, M. Sobhani, O. Mirzaee, M. Zakeri, Ceram. Int. 46 (16), 25106-25112 (2020).
[4] M .D. Brut, D. Tetard, C. Tixier, C. Faure, E. Chabas, 10th International Conference of the European Ceramic Society, Berlin, 1315-1320 (2007).
[5] A.K. Kumar, K. Kurokawa, Books: Tungsten carbide – Processing and applications, chapter 2: Spark plasma sintering of ultrafine WC powders: A combined kinetic and microstructural study (2012).
[6] R .G. Crookes, B. Marz, H. Wu, Mater. Des. 187, 108360 (2020).
[7] C. Bargeron, R. Benson, R. Newman, A.N. Jette, T.E. Phillips, Mater. Sci. (1993).
[8] C. Bagnall, J. Capo, W.J. Moorhead, Metallography Microstructure Analysis 7, 661-679 (2018).
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Authors and Affiliations

Hyun-Kuk Park
1
ORCID: ORCID
Ik-Hyun Oh
1
ORCID: ORCID
Ju-Hun Kim
1 2
ORCID: ORCID
Sung-Kil Hong
2
ORCID: ORCID
Jeong-Han Lee
1 2
ORCID: ORCID

  1. Korea Institute of Industrial Technology, Smart Mobility Materials and Components R&D Group, 6, Cheomdan-gwa giro 208-gil, Buk-gu, Gwan g-Ju, 61012, Korea
  2. Chonnam National University, Materials Science & Engineering, 77, Yong-bongro, Buk-gu, Gwan g-ju, 61186, Korea
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Abstract

With the recent advancement in technology for titanium metal powder injection molding and additive manufacturing, high yield and good flowability powder production is needed. In this study, titanium powder was produced through vacuum induction melting gas atomization with a cold crucible, which can yield various alloy compositions without the need for material pretreatment. The gas behavior in the injection section was simulated according to the orifice protrusion length for effective powder production, and powder was prepared based on the simulation results. The gas distribution changes with the orifice protrusion length, which changes the location of the recirculation zone and production yield of the powder. The produced powders had a spherical morphology, and the content of impurities (N, O) changed with the injected-gas purity.

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Authors and Affiliations

Dae-Kyeom Kim
Young Il Kim
Hwaseon Lee
Young Do Kim
ORCID: ORCID
Dongju Lee
Bin Lee
Taek-Soo Kim
ORCID: ORCID

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